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 Fig. 1 | Junghans 688.13 (Buren 12) Features automatic chronograph, 60s, 30min, 12h, cam switched date: set by changing 21-24h Data 13.75''', Dm= 31mm H= 7.7mm 17 jewels f = 21600 A/h power reserve 42h Balance staff U3426 Stem W3398 Mainspring / battery 1.60 x 10.5 x 0.105mm Comments about the data | Remarks joint development of Hamilton-Buren, Breitling and Heuer module Dubois-Depraz 8510 on modified Buren 1281 crown at 9h micro rotor double excenter regulator for curb pins and stud carrier indirectly driven minute allows a low profile (details cf. Buren 1320) Example, year: signature; shock device 1972: JRGK (J.R. Gorgerat, Kelek SA), Swiss, 17 Jewels; Incabloc © N. Helfer Not for Sale! The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating. |
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